Bonkers. The Bloke on the Phone told you more than he should have. The email is deliberately non committal to avoid any liability on their part. Anyway, if you are going to fail the VSE, then you will fail it whether you do it at Home on your computer or whether you do it at the Southern/GTR assessment day next mon, and its the same with the M7SJT. The more applications you have on the go, the more chance you have of one of them being successful. MTR are taking on so many Trainees that if you pass the tests and if you do your research on the company the route and the trains then you have a much greater chance of getting offered a job.